Hi campbellsa,
I would consider all the different factors in my own “personal value equation” including your own personal testing and the suitability of each mattress, any difference in prices and materials, the exchange or adjustment options available after a purchase if you make the wrong choice and the costs involved in making exchanges, the risk of each purchase, your confidence that any mattress is a “match” for your specific needs and preferences, and any of the other objective, subjective, and intangible factors that are involved in each purchase that are most important to you.
My choice may be very different to yours or someone else’s but any difference in price would certainly not be the only thing I considered. While the price and components of a mattress is of course an important part of value … when you look back on a mattress purchase a decade from now you will remember much more about how well you slept (or didn’t) and how long the mattress lasted you than you will about the price you paid.
A mattress that doesn’t match your specific needs and preferences in terms of PPP would have little value to you no matter what you paid for it so when you are considering a mattress that you haven’t tested in person it’s a good idea to attach a “value” to the extra risk involved.
I can tell you that neither one has any obvious weak links in heir design and both could make good choices if they are a good “match” for you in terms of PPP and the other parts of your personal value equation.
I added a paragraph in my last reply at the end that answered this (I didn’t notice the question until after I posted the original reply so I edited it afterwards).
Phoenix